content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.*;
  
  import io.reactivex.common.*;
  import io.reactivex.common.Scheduler.Worker;
  import io.reactivex.common.internal.disposables.DisposableHelper;
  import io.reactivex.observable.*;
  import io.reactivex.observable.observers.SerializedObserver;
  
  public final class ObservableDebounceTimed<T> extends AbstractObservableWithUpstream<T, T> {
      final long timeout;
      final TimeUnit unit;
      final Scheduler scheduler;
  
      public ObservableDebounceTimed(ObservableSource<T> source, long timeout, TimeUnit unit, Scheduler scheduler) {
          super(source);
          this.timeout = timeout;
          this.unit = unit;
          this.scheduler = scheduler;
      }
  
      @Override
      public void subscribeActual(Observer<? super T> t) {
          source.subscribe(new DebounceTimedObserver<T>(
                  new SerializedObserver<T>(t),
                  timeout, unit, scheduler.createWorker()));
      }
  
      static final class DebounceTimedObserver<T>
      implements Observer<T>, Disposable {
          final Observer<? super T> actual;
          final long timeout;
          final TimeUnit unit;
          final Scheduler.Worker worker;
  
          Disposable s;
  
          final AtomicReference<Disposable> timer = new AtomicReference<Disposable>();
  
          volatile long index;
  
          boolean done;
  
          DebounceTimedObserver(Observer<? super T> actual, long timeout, TimeUnit unit, Worker worker) {
              this.actual = actual;
              this.timeout = timeout;
              this.unit = unit;
              this.worker = worker;
          }
  
          @Override
          public void onSubscribe(Disposable s) {
              if (DisposableHelper.validate(this.s, s)) {
                  this.s = s;
                  actual.onSubscribe(this);
              }
          }
  
          @Override
          public void onNext(T t) {
              if (done) {
                  return;
              }
              long idx = index + 1;
              index = idx;
  
              Disposable d = timer.get();
              if (d != null) {
                  d.dispose();
              }
  
              DebounceEmitter<T> de = new DebounceEmitter<T>(t, idx, this);
              if (timer.compareAndSet(d, de)) {
                  d = worker.schedule(de, timeout, unit);
  
                  de.setResource(d);
              }
  
          }
  
          @Override
          public void onError(Throwable t) {
              if (done) {
                  RxJavaCommonPlugins.onError(t);
                  return;
              }
              done = true;
              actual.onError(t);
              worker.dispose();
          }
  
          @Override
          public void onComplete() {
              if (done) {
                  return;
              }
              done = true;
  
              Disposable d = timer.get();
              if (d != DisposableHelper.DISPOSED) {
                  @SuppressWarnings("unchecked")
                  DebounceEmitter<T> de = (DebounceEmitter<T>)d;
                  if (de != null) {
                      de.run();
                  }
                  actual.onComplete();
                  worker.dispose();
              }
          }
  
          @Override
          public void dispose() {
              s.dispose();
              worker.dispose();
          }
  
          @Override
          public boolean isDisposed() {
              return worker.isDisposed();
          }
  
          void emit(long idx, T t, DebounceEmitter<T> emitter) {
              if (idx == index) {
                  actual.onNext(t);
                  emitter.dispose();
              }
          }
      }
  
      static final class DebounceEmitter<T> extends AtomicReference<Disposable> implements Runnable, Disposable {
  
          private static final long serialVersionUID = 6812032969491025141L;
  
          final T value;
          final long idx;
          final DebounceTimedObserver<T> parent;
  
          final AtomicBoolean once = new AtomicBoolean();
  
          DebounceEmitter(T value, long idx, DebounceTimedObserver<T> parent) {
              this.value = value;
              this.idx = idx;
              this.parent = parent;
          }
  
          @Override
          public void run() {
              if (once.compareAndSet(false, true)) {
                  parent.emit(idx, value, this);
              }
          }
  
          @Override
          public void dispose() {
              DisposableHelper.dispose(this);
          }
  
          @Override
          public boolean isDisposed() {
              return get() == DisposableHelper.DISPOSED;
          }
  
          public void setResource(Disposable d) {
              DisposableHelper.replace(this, d);
          }
      }
  }
  